Relationship Between Taklimakan Desert Ground Heat Fluxes and Summer Precipitation Abnormity in South Xinjiang
By using the summer(June-August) monthly mean precipitation data from 25 meteor ological stations in Tarim Basin during 1979-2003 and the new NCEP/DOE monthly mean grou nd heat fluxes data, the relationships between spring and summer ground heat flu xes of Taklimakan desert and summer precipitation abnormity in South Xinjian g were analyzed with the SVD (singular value decomposition). Results show that t he first pattern from SVD indicates the coupling characteristics of ground heat fields and summer precipitation fields with closely temporal and spatial correlations. The west and northwest areas in SouthXinjiang and de sert middle part (37°-40°N, 78°-83°E） are the prominence area of SVD coupling co r relation. The first SVD mode of desert spring and summer surface sensible heat f ield and summer precipitation in the South Xinjiang shows that there is an appar ent negative co rrelation between ground sensible heat fields and the summer precipitation. When the sensible heat of main desert region is small (great), and desert middle par t is small (great) obviously, summer precipitation anomaly corresponds to more (les s) in South Xinjiang, in which the west and northwest areas of the South Xinjian g are notably more (less). The first SVD mode of desert spring and s ummer surface latent heat field and summer precipitation in the South Xinjiang s hows that there is an apparent positive correlation between ground latent heat f ields and the summer p recipitation. When the latent heat of whole desert is large (small), and desert middle part is large (small) obviously, summer precipitation anomaly corresponds to more (less) in South Xinjiang, in which the west and northwest areas of the South Xinjiang are notably more (less). Ground sensible heat and latent heat a bnormity of Taklimakan desert in spring is a signal of summer precipitation in S outh Xinjiang.